pitot tube flow measurement
pitot tube flow measurement
(OP)
I am using a pitot tube connected to a differential pressure gauge and I get the following readings. The static pressure (perpendicular) was connected to the low side and the total pressure (parallel) was connected to the high side of the gague.
Dp static Total
30Hz - .31inWC .13inWC .44inWC
These readings are the pressures that I got when I inserted a pitot tube into a 30 inch circular duct. I inserted the tube exactly 15 inches to be in the center and the tip was directly parallel with the flow. The flow transmitter says we were flowing 3,400 scfm, but my calculation I did comes up with 10,921 scfm. Can anyone help me determine what is the correct flow with these process parameters.
Process media - air
Temperature - 80F
Diameter of duct - 30 inches
Dp static Total
30Hz - .31inWC .13inWC .44inWC
These readings are the pressures that I got when I inserted a pitot tube into a 30 inch circular duct. I inserted the tube exactly 15 inches to be in the center and the tip was directly parallel with the flow. The flow transmitter says we were flowing 3,400 scfm, but my calculation I did comes up with 10,921 scfm. Can anyone help me determine what is the correct flow with these process parameters.
Process media - air
Temperature - 80F
Diameter of duct - 30 inches





RE: pitot tube flow measurement
RE: pitot tube flow measurement
Are you stating that your device is equivalent to a Pitot-Static or Prandtl Tube? And all three pressures are measured?
RE: pitot tube flow measurement
It's odd that you're off by such an odd factor in your flow transmitter -- can you give us info on the flow device and the parameters that are programmed into it?
Good on ya,
Goober Dave
RE: pitot tube flow measurement